Medium of Exchange
= a core Function of Money, along with Standard of Value and Store of Value
Description
Bernard Lietaer:
"For currencies that are not playing the role of standard of value (i.e. the majority of the complementary currency systems), the function of medium of exchange is the most important one. The ease and costs of their use as medium of exchange depends predominantly of the support medium used in the currency." (http://www.global-community.org/gc/newsfiles/25/Community%20Currency%20Guide.pdf)